1 /* 2 * acpi_tables.c - ACPI Boot-Time Table Parsing 3 * 4 * Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 5 * 6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 19 * 20 */ 21 22 /* Uncomment next line to get verbose printout */ 23 /* #define DEBUG */ 24 #define pr_fmt(fmt) "ACPI: " fmt 25 26 #include <linux/init.h> 27 #include <linux/kernel.h> 28 #include <linux/smp.h> 29 #include <linux/string.h> 30 #include <linux/types.h> 31 #include <linux/irq.h> 32 #include <linux/errno.h> 33 #include <linux/acpi.h> 34 #include <linux/bootmem.h> 35 36 #define ACPI_MAX_TABLES 128 37 38 static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" }; 39 static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" }; 40 41 static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata; 42 43 static int acpi_apic_instance __initdata; 44 45 /* 46 * Disable table checksum verification for the early stage due to the size 47 * limitation of the current x86 early mapping implementation. 48 */ 49 static bool acpi_verify_table_checksum __initdata = false; 50 51 void acpi_table_print_madt_entry(struct acpi_subtable_header *header) 52 { 53 if (!header) 54 return; 55 56 switch (header->type) { 57 58 case ACPI_MADT_TYPE_LOCAL_APIC: 59 { 60 struct acpi_madt_local_apic *p = 61 (struct acpi_madt_local_apic *)header; 62 pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n", 63 p->processor_id, p->id, 64 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 65 } 66 break; 67 68 case ACPI_MADT_TYPE_LOCAL_X2APIC: 69 { 70 struct acpi_madt_local_x2apic *p = 71 (struct acpi_madt_local_x2apic *)header; 72 pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n", 73 p->local_apic_id, p->uid, 74 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 75 } 76 break; 77 78 case ACPI_MADT_TYPE_IO_APIC: 79 { 80 struct acpi_madt_io_apic *p = 81 (struct acpi_madt_io_apic *)header; 82 pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n", 83 p->id, p->address, p->global_irq_base); 84 } 85 break; 86 87 case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE: 88 { 89 struct acpi_madt_interrupt_override *p = 90 (struct acpi_madt_interrupt_override *)header; 91 pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n", 92 p->bus, p->source_irq, p->global_irq, 93 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 94 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]); 95 if (p->inti_flags & 96 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)) 97 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n", 98 p->inti_flags & 99 ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK)); 100 } 101 break; 102 103 case ACPI_MADT_TYPE_NMI_SOURCE: 104 { 105 struct acpi_madt_nmi_source *p = 106 (struct acpi_madt_nmi_source *)header; 107 pr_info("NMI_SRC (%s %s global_irq %d)\n", 108 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 109 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 110 p->global_irq); 111 } 112 break; 113 114 case ACPI_MADT_TYPE_LOCAL_APIC_NMI: 115 { 116 struct acpi_madt_local_apic_nmi *p = 117 (struct acpi_madt_local_apic_nmi *)header; 118 pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n", 119 p->processor_id, 120 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ], 121 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 122 p->lint); 123 } 124 break; 125 126 case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI: 127 { 128 u16 polarity, trigger; 129 struct acpi_madt_local_x2apic_nmi *p = 130 (struct acpi_madt_local_x2apic_nmi *)header; 131 132 polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK; 133 trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2; 134 135 pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n", 136 p->uid, 137 mps_inti_flags_polarity[polarity], 138 mps_inti_flags_trigger[trigger], 139 p->lint); 140 } 141 break; 142 143 case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE: 144 { 145 struct acpi_madt_local_apic_override *p = 146 (struct acpi_madt_local_apic_override *)header; 147 pr_info("LAPIC_ADDR_OVR (address[%p])\n", 148 (void *)(unsigned long)p->address); 149 } 150 break; 151 152 case ACPI_MADT_TYPE_IO_SAPIC: 153 { 154 struct acpi_madt_io_sapic *p = 155 (struct acpi_madt_io_sapic *)header; 156 pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n", 157 p->id, (void *)(unsigned long)p->address, 158 p->global_irq_base); 159 } 160 break; 161 162 case ACPI_MADT_TYPE_LOCAL_SAPIC: 163 { 164 struct acpi_madt_local_sapic *p = 165 (struct acpi_madt_local_sapic *)header; 166 pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n", 167 p->processor_id, p->id, p->eid, 168 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 169 } 170 break; 171 172 case ACPI_MADT_TYPE_INTERRUPT_SOURCE: 173 { 174 struct acpi_madt_interrupt_source *p = 175 (struct acpi_madt_interrupt_source *)header; 176 pr_info("PLAT_INT_SRC (%s %s type[0x%x] id[0x%04x] eid[0x%x] iosapic_vector[0x%x] global_irq[0x%x]\n", 177 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK], 178 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2], 179 p->type, p->id, p->eid, p->io_sapic_vector, 180 p->global_irq); 181 } 182 break; 183 184 case ACPI_MADT_TYPE_GENERIC_INTERRUPT: 185 { 186 struct acpi_madt_generic_interrupt *p = 187 (struct acpi_madt_generic_interrupt *)header; 188 pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n", 189 p->uid, p->base_address, 190 p->arm_mpidr, 191 (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled"); 192 193 } 194 break; 195 196 case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR: 197 { 198 struct acpi_madt_generic_distributor *p = 199 (struct acpi_madt_generic_distributor *)header; 200 pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n", 201 p->gic_id, p->base_address, 202 p->global_irq_base); 203 } 204 break; 205 206 default: 207 pr_warn("Found unsupported MADT entry (type = 0x%x)\n", 208 header->type); 209 break; 210 } 211 } 212 213 int __init 214 acpi_parse_entries(char *id, unsigned long table_size, 215 acpi_tbl_entry_handler handler, 216 struct acpi_table_header *table_header, 217 int entry_id, unsigned int max_entries) 218 { 219 struct acpi_subtable_header *entry; 220 int count = 0; 221 unsigned long table_end; 222 223 if (acpi_disabled) 224 return -ENODEV; 225 226 if (!id || !handler) 227 return -EINVAL; 228 229 if (!table_size) 230 return -EINVAL; 231 232 if (!table_header) { 233 pr_warn("%4.4s not present\n", id); 234 return -ENODEV; 235 } 236 237 table_end = (unsigned long)table_header + table_header->length; 238 239 /* Parse all entries looking for a match. */ 240 241 entry = (struct acpi_subtable_header *) 242 ((unsigned long)table_header + table_size); 243 244 while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) < 245 table_end) { 246 if (entry->type == entry_id 247 && (!max_entries || count < max_entries)) { 248 if (handler(entry, table_end)) 249 return -EINVAL; 250 251 count++; 252 } 253 254 /* 255 * If entry->length is 0, break from this loop to avoid 256 * infinite loop. 257 */ 258 if (entry->length == 0) { 259 pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, entry_id); 260 return -EINVAL; 261 } 262 263 entry = (struct acpi_subtable_header *) 264 ((unsigned long)entry + entry->length); 265 } 266 267 if (max_entries && count > max_entries) { 268 pr_warn("[%4.4s:0x%02x] ignored %i entries of %i found\n", 269 id, entry_id, count - max_entries, count); 270 } 271 272 return count; 273 } 274 275 int __init 276 acpi_table_parse_entries(char *id, 277 unsigned long table_size, 278 int entry_id, 279 acpi_tbl_entry_handler handler, 280 unsigned int max_entries) 281 { 282 struct acpi_table_header *table_header = NULL; 283 acpi_size tbl_size; 284 int count; 285 u32 instance = 0; 286 287 if (acpi_disabled) 288 return -ENODEV; 289 290 if (!id || !handler) 291 return -EINVAL; 292 293 if (!strncmp(id, ACPI_SIG_MADT, 4)) 294 instance = acpi_apic_instance; 295 296 acpi_get_table_with_size(id, instance, &table_header, &tbl_size); 297 if (!table_header) { 298 pr_warn("%4.4s not present\n", id); 299 return -ENODEV; 300 } 301 302 count = acpi_parse_entries(id, table_size, handler, table_header, 303 entry_id, max_entries); 304 305 early_acpi_os_unmap_memory((char *)table_header, tbl_size); 306 return count; 307 } 308 309 int __init 310 acpi_table_parse_madt(enum acpi_madt_type id, 311 acpi_tbl_entry_handler handler, unsigned int max_entries) 312 { 313 return acpi_table_parse_entries(ACPI_SIG_MADT, 314 sizeof(struct acpi_table_madt), id, 315 handler, max_entries); 316 } 317 318 /** 319 * acpi_table_parse - find table with @id, run @handler on it 320 * @id: table id to find 321 * @handler: handler to run 322 * 323 * Scan the ACPI System Descriptor Table (STD) for a table matching @id, 324 * run @handler on it. 325 * 326 * Return 0 if table found, -errno if not. 327 */ 328 int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler) 329 { 330 struct acpi_table_header *table = NULL; 331 acpi_size tbl_size; 332 333 if (acpi_disabled) 334 return -ENODEV; 335 336 if (!id || !handler) 337 return -EINVAL; 338 339 if (strncmp(id, ACPI_SIG_MADT, 4) == 0) 340 acpi_get_table_with_size(id, acpi_apic_instance, &table, &tbl_size); 341 else 342 acpi_get_table_with_size(id, 0, &table, &tbl_size); 343 344 if (table) { 345 handler(table); 346 early_acpi_os_unmap_memory(table, tbl_size); 347 return 0; 348 } else 349 return -ENODEV; 350 } 351 352 /* 353 * The BIOS is supposed to supply a single APIC/MADT, 354 * but some report two. Provide a knob to use either. 355 * (don't you wish instance 0 and 1 were not the same?) 356 */ 357 static void __init check_multiple_madt(void) 358 { 359 struct acpi_table_header *table = NULL; 360 acpi_size tbl_size; 361 362 acpi_get_table_with_size(ACPI_SIG_MADT, 2, &table, &tbl_size); 363 if (table) { 364 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n", 365 acpi_apic_instance); 366 pr_warn("If \"acpi_apic_instance=%d\" works better, " 367 "notify linux-acpi@vger.kernel.org\n", 368 acpi_apic_instance ? 0 : 2); 369 early_acpi_os_unmap_memory(table, tbl_size); 370 371 } else 372 acpi_apic_instance = 0; 373 374 return; 375 } 376 377 /* 378 * acpi_table_init() 379 * 380 * find RSDP, find and checksum SDT/XSDT. 381 * checksum all tables, print SDT/XSDT 382 * 383 * result: sdt_entry[] is initialized 384 */ 385 386 int __init acpi_table_init(void) 387 { 388 acpi_status status; 389 390 if (acpi_verify_table_checksum) { 391 pr_info("Early table checksum verification enabled\n"); 392 acpi_gbl_verify_table_checksum = TRUE; 393 } else { 394 pr_info("Early table checksum verification disabled\n"); 395 acpi_gbl_verify_table_checksum = FALSE; 396 } 397 398 status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0); 399 if (ACPI_FAILURE(status)) 400 return -EINVAL; 401 402 check_multiple_madt(); 403 return 0; 404 } 405 406 static int __init acpi_parse_apic_instance(char *str) 407 { 408 if (!str) 409 return -EINVAL; 410 411 if (kstrtoint(str, 0, &acpi_apic_instance)) 412 return -EINVAL; 413 414 pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance); 415 416 return 0; 417 } 418 419 early_param("acpi_apic_instance", acpi_parse_apic_instance); 420 421 static int __init acpi_force_table_verification_setup(char *s) 422 { 423 acpi_verify_table_checksum = true; 424 425 return 0; 426 } 427 428 early_param("acpi_force_table_verification", acpi_force_table_verification_setup); 429